Journal
VACUUM
Volume 199, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2022.110970
Keywords
Flat -panel X-ray source; Pulsed field emission; ZnO nanowire
Funding
- National Key Research and Development Program of China [2016YFA0202001]
- National Natural Science Foundation of China [91833303]
- Science and Technology Department, Guangdong Province [2020B0101020002]
- Fundamental Research Funds for the Central Universities
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In this study, a fully vacuum-sealed flat-panel X-ray source was fabricated with a molybdenum metal anode and ZnO nanowire field emitters array cathode. The device exhibited higher emission current and dose rate when driven by pulsed voltage compared to direct current. The enhanced emission current enabled fast and clear imaging of high-speed moving objects, indicating the significance of this research for the application of large area flat-panel X-ray sources in dynamic imaging.
A fully vacuum-sealed flat-panel X-ray source was fabricated composed of molybdenum metal anode and ZnO nanowire field emitters array cathode. The cathode current and X-ray radiation dose rate of the device were measured when the anode is applied with direct current (DC) and pulsed voltage, respectively. It is found that the peak emission current and corresponding dose rate under pulsed voltage driving are much higher than those under DC voltage driving. The phenomena may be explained by a plasma induced field emission enhancement related to the electron bombardment induced gas desorption. Clear projection X-ray imaging of moving objects was obtained using pulsed voltage driving. The result shows that owing to the enhanced emission current driven by the pulsed voltage, the flat-panel X-ray source can achieve fast and clear imaging of high-speed moving objects. Our results are of significance for the application of large area flat-panel X-ray source in dynamic imaging.
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